diff --git a/chapter5/src/main/java/nia.chapter5/ByteBufExamples.java b/chapter5/src/main/java/nia/chapter5/ByteBufExamples.java
similarity index 100%
rename from chapter5/src/main/java/nia.chapter5/ByteBufExamples.java
rename to chapter5/src/main/java/nia/chapter5/ByteBufExamples.java
diff --git a/chapter5/src/main/java/nia.chapter5/package-info.java b/chapter5/src/main/java/nia/chapter5/package-info.java
similarity index 100%
rename from chapter5/src/main/java/nia.chapter5/package-info.java
rename to chapter5/src/main/java/nia/chapter5/package-info.java